More fullnode -> validator renaming (#4414)

* s/fullnode_config/validator_config/g

* s/FullnodeConfig/ValidatorConfig/g

* mv core/lib/fullnode.rs core/lib/validator.rs

* s/Fullnode/Validator/g

* Add replicator-x.sh

* Rename fullnode.md to validator.md

* cargo fmt

net/net.sh

@@ -464,7 +464,7 @@ start() {
   fi
 
   declare bootstrapLeader=true
-  declare nodeType=fullnode
+  declare nodeType=validator
   declare loopCount=0
   for ipAddress in "${fullnodeIpList[@]}" - "${blockstreamerIpList[@]}"; do
     if [[ $ipAddress = - ]]; then